Home Support Colored Wiring Diagrams #8B - #8D2 #8C2

Colored Wiring Diagram #8C2

Two Forced Air Furnaces sharing a replacement air supply duct controlled by one fresh air damper with Power Open Damper
HMI Hoyme Manufacturing Inc. Special Note: Circuits are colored for clarification only and are not necessarily those found in actual installations.
Diagram #8C2: Two Forced Air Furnaces sharing a common replacement air supply duct controlled by one Power Open fresh air damper. If using a Power Close damper, go to wiring Diagram #8C for details.

1. Replacement Air Control Damper, Power Open (HAC-0x10-OPO) where ‘x’ = diameter of the damper.
2. 24Vac Relay Adaptor (ADP-0241-05A) to operate the damper from either furnace.
3. Optional Toggle Switch (SPDT) to override the damper to be continually in the open position.

OPERATION:
1. The Power Open (PO) Replacement Air Control Damper will open when the thermostat of either furnace asks for heat, and will remain open until both thermostats turn the furnaces off. 
2. The ADP-0241-05A uses both sides of the relay to control the 24Vac circuits and damper. 
3. Optional Toggle Switch (SPDT) is used to override the damper to be continuously in the open position. For ease of installing an Optional Toggle Switch, go to Diagram #8C3 for details on a ready mounted Toggle  Switch.
 
N.B. Replacement Air Damper is not affected the ‘Manual’ setting of the furnace fan or by the operation of an Air Conditioner.
 
1222-ld - Printed in Canada

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Last Updated (Thursday, 09 February 2017 12:20)